hot water system rinnai piping manual.pdf

Hot Water System Design Manual

Plumbing schematics for single and multiple Rinnai tankless water heaters in use with domestic systems, recirculation, and storage tanks.

This document, R-TRWH-E-02 Rev B (2/27/2008), supersedes and replaces the previous Hot Water System Design Manual, R-TRWH-E-02 Rev A(6/14/2007).

2

Certifications..................................................................................3 Rinnai Accessories........................................................................4 Model Applicability ........................................................................5 Water Quality and Scale ................................................................6 Pump Sizing for Circulation..........................................................7 Tank Water Heaters in a Circulation Loop...................................8 Additional Guidelines....................................................................8 Pump Sizing for Storage Tank Applications ...............................9 Pressure Loss Curves - V Series................................................10 Pressure Loss Curves - VA Series .............................................11 Domestic Hot Water - Standard Installation 1 Water Heater (WH-1)..................................................................12 2 Water Heaters (WH-2) ................................................................13 3 Water Heaters (WH-3) ................................................................14 4 Water Heaters (WH-4) ................................................................15 5 Water Heaters (WH-5) ................................................................16 6 Water Heaters (WH-6) ................................................................17 Domestic Hot Water with Optional Freeze Protection on Outdoor Models 1 Water Heater (WH-1-D) ..............................................................18 2 Water Heaters (WH-2-D) ............................................................19 3 Water Heaters (WH-3-D) ............................................................20 6 Water Heaters (WH-6-D) ............................................................21 Domestic Hot Water with Circulation Systems 1 Water Heater - Preferred (WH-1-RGE).......................................22 1 Water Heater - Optional (WH-1-R)..............................................23 2 Water Heaters - Preferred (WH-2-RGE) .....................................24 2 Water Heaters - Optional (WH-2-R)............................................25 3 Water Heaters - Preferred (WH-3-RGE) .....................................26 6 Water Heaters - Preferred (WH-6-RGE) .....................................27 Domestic Hot Water with Backup Storage Tanks 1 Water Heater (WH-1-B) ..............................................................28 1 Water Heater with Circulation (WH-1-B-R) .................................29 2 Water Heaters (WH-2-B) ............................................................30 2 Water Heater with Circulation (WH-2-B-R) .................................31 3 Water Heaters (WH-3-B) ............................................................32 3 Water Heater with Circulation (WH-3-B-R) .................................33 6 Water Heaters (WH-6-B) ............................................................34 6 Water Heater with Circulation (WH-6-B-R) .................................35 Maintenance Procedure Scale Flush Procedure (M-1-F) .....................................................36

Table of Contents

3

Certifications

V53e......................REU-VAM1620W R63LSe .................REU-VA2024WD * R75LSe .................REU-VA2528WD-US-(N, P) * R75LSe .................REU-VA2528WD(A)-US-(N, P) * R94LSe .................REU-VA2535WD-US-(N, P) * R98LSe .................REU-VA3237W-US-(N, P) * R98LSeASME.......REU-VA3237W-ASME-(N, P) * R42e .....................REU-V1616W-(N, P) C42e .....................REU-V1616WC-(N, P) * R53e .....................REU-V2020W-(N, P) C53e .....................REU-V2020WC-(N, P) * R70e .....................REU-V2526W-US-(N, P) R85e .....................REU-V2532W-US-(N, P) C85e .....................REU-V2532WC-US-(N, P) * R85ePLUS ............REU-V2532WD-US-(N, P) C85ePLUS ............REU-V2532WCD-US-(N, P) * R98e .....................REU-V3237W-US-(N, P) C98e .....................REU-V3237WC-US-(N, P) * R98eASME ...........REU-V3237W-ASME-(N, P) C98eASME ...........REU-V3237WC-ASME-(N, P) *

R50LSi ..................REU-VA2019FFUD-US-(N, P) * R75LSi ..................REU-VA2528FFUD-US-(N, P) * R75LSi ..................REU-VA2528FFUD(A)-US-(N, P) * R94LSi ..................REU-VA2535FFUD-US-(N, P)* R98LSi ..................REU-VA3237FFU-US-(N, P) * R98LSiASME ........REU-VA3237FFU-ASME-(N, P) * R53i.......................REU-V2520FFU-US-(N, P) C53i.......................REU-V2520FFUC-US-(N, P) * R53i.......................REU-V2520FFUD-US-(N, P) C53i.......................REU-V2520FFUCD-US-(N, P) * R85i.......................REU-V2532FFU-US-(N, P) C85i.......................REU-V2532FFUC-US-(N, P) * R85iPLUS .............REU-V2532FFUD-US-(N, P) C85iPLUS .............REU-V2532FFUCD-US-(N, P) * R98i.......................REU-V3237FFU-US-(N, P) C98i.......................REU-V3237FFUC-US-(N, P) * R98iASME.............REU-V3237FFU-ASME-(N, P) C98iASME.............REU-V3237FFUC-ASME-(N, P) *

The models listed above have received the following certifications except where noted:

Certified to applicable U.S. standards for appliances using gas or other petroleum fuel. Certified to applicable Canadian standards for appliances using gas or other petroleum fuel. Certified by the Uniform Plumbing Code (UPC) Certified by National Sanitation Foundation (NSF), www.nsf.org

(indoor models must use the NSF approved top guard)

REU-VAM1620W is not NSF approved

Energy efficiency certified by Gas Appliance Manufacturers Association (GAMA), www.gamanet.org Met the California Energy Commission (CEC) standards Approved by the Commonwealth of Massachusetts Received New York City’s Material and Equipment Acceptance (MEA)

Trade Name CSA Listing Trade Name CSA Listing

* authorized for commercial use

Indoor Water Heaters Outdoor Water Heaters

4

MSA Controller: The MSA controllers (Pack A) and cables (Pack B) are optional accessories that electronically connect 2 to 5 water heaters and allows them to function as one hot water source. Two water heaters require one MSA Pack A. Each additional water heater beyond two requires one MSA Pack B.

EZConnect: The EZConnect cable is an optional accessory that electronically connects 2 water heaters and allows them to function as one hot water source.

PVA Valves: Pressure activated valves that allow each water heater (max 5) to turn on as necessary to meet the demand for hot water

Remote Controllers: MC-91-1US - Controller included with the unit except for the VAM1620W MCC-91-1US - For commercial and hydronic applications allowing temperatures

above 140º F. Refer to model applicability MC-100V-1US - Deluxe controller BC-100V-1US - Bathroom controller MC-502RC-1US-MS - Wireless controller with transceiver MC-502RC-1US-S - Wireless controller MC-502RC-1US-M - Transceiver

Rinnai is continually updating and introducing new products and accessories. For the latest information, contact Rinnai at 1-800-621-9419, FAX: 1-888-474-6624, or www.rinnai.us.

Certifications

Rinnai Accessories Multiple Unit Connections (refer to model applicability)

• Do not install both the EZConnect and the MSA packs because they are not designed to operate together.

• Water heaters connected with the EZConnect Cable or the MSA packs cannot be used for the bathfill function.

• Temperature settings can only be changed on the controller for the primary unit. • Do not use the EZConnect or MSA packs with storage tank applications.

Guidelines for multiple unit connections:

Rinnai Installation Kits - available with threaded (F) or sweated (C) connections For models rated below 200,000 BTU/hr, provides isolation valves, pressure relief

valve, and full port drains with easy union installation

For models rated above 200,000 BTU/hr, provides isolation valves, pressure relief valve, and full port drains with easy union installation

WRIK-F, WRIK-C, SRIK-F, SRIK-C: WRIK-32F, WRIK-32C:

Recess Boxes: Recesses unit into the wall, protecting and hiding the unit from view

Pipe Covers: For security, weather protection, and finished look

R

These models are built in accordance with the requirements of the ASME Boiler and Pressure Vessel Code and received the Certificate of Authorization from the National Board. The heat exchanger has the NB and the HLW stamps.

R98LSiASME R98LSeASME

R98iASME C98iASME

R98eASME C98eASME

5

Outdoor

Indoor

Model Recess Boxes Pipe Covers Electronic Connection

Remote Controllers

R42e, C42e R53e, C53e

RGB-20-U PC-20-W (white)

MSA-2 [1]

V53e

R63LSe PCD01-SM2 (silver) [2]

R70e, R85e, C85e RGB-25-U

or RGB-25U-MSAL

(with moisture seal flange)

PC-25-W (white) PC-25-G (gray)

MSA-2 [1] R85ePLUS, C85ePLUS PCD03-SM (silver)

PCD03-MG (white)

R75LSe, R94LSe PCD03-SM2 (silver)

EZ Connect [5], MSA-2

[2]

R98e, C98e, R98eASME, C98eASME, RGB-32 PC-32-W (white)

PC-32-G (gray) [1]

R98LSe, R98LSeASME [2]

[6]

Model Venting Type Integrated

Condensate Collector

Electronic Connection

Remote Controllers

R53i, C53i, R53iPLUS, C53iPLUS R85i, C85i, R85iPLUS, C85iPLUS

Concentric 3” / 5” [4]

NO [3] MSA-2 [1]

R50LSi R75LSi R94LSi

YES [2]

R98i, C98i, R98iASME, C98iASME

4” for intake and 4” for exhaust

[4] NO [3]

[1]

R98LSi, R98LSiASME [2]

EZ Connect [5], MSA-2

[1] MC-91, MC-100, BC-100, MC-502 [2] MC-91, MC-100, BC-100, MC-502, MCC-91 [3] The Condensate Collector vent piece and the Condensate Trap (224050) for trapping and draining

condensate may be required depending on your installation. Refer to the Operation and Installation Manual.

[4] Refer to the Operation and Installation Manual [5] The EZ Connect will connect a maximum of 2 water heaters. [6] Electronic connection is not available for these models. Connection can be made using pressure

activating Rinnai PVA valves.

Notes

Model Applicability (Accessories)

6

Water Quality and Scale

A complete water analysis and an understanding of system requirements are needed to protect the Rinnai tankless water heaters and water heating systems from scale. Water analysis shows whether water is hard or soft. Hard water, unless treated, will cause scaling or liming of the Rinnai heat exchanger. The rate of scaling increases with temperature and usage because calcium carbonate and other scaling compounds lose solubility (fall out of solution) at higher temperatures. For example, for every 20°F over 140°F, the rate of scale increases by a factor of 2 (See figure below). Reference target water quality levels found in the operation / installation manual and consider water treatment if these levels are exceeded. *

210

180

150

120

90

60

30

0 3900

3300

2700

2100

1500

900

300

0

WATER USAGE, gal/day

LIM

E D

EPO

SITE

D, l

b/yr

180°F

170°F

160°F

150°F

140°F

120°F

BASED ON 10 grains/gal HARDNESS

*Source 2003 ASHRAE Handbook HVAC Applications

*

7

Pump Sizing for Circulation 1. Use the chart below or one appropriate for your conditions to determine the heat loss in the length of

the hot water supply and return piping. For example, 100 ft of 1-1/2 in bare copper tubing results in a heat loss of 5300 Btu/h.

2. Determine the acceptable temperature drop at the last fixture in the loop. For example, if the supply temperature from the water heater is 120 ºF (49 ºC) and an acceptable temperature at the last fixture is 100 ºF (38 ºC) then the acceptable temperature drop is 20 ºF (7 ºC).

3. Calculate the required pump flow rate using the following formula:

FLOW RATE (gpm) = HEAT LOSS (BTU / h)

500 X ACCEPTABLE TEMPERATURE DROP (ºF )

4. Based on the above calculations select a pump for the type of circulation system you will be utilizing:

A). Preferred Method (reference drawing WH-1-RGE) - Reference pump manufacturers flow vs. pressure specifications to select a pump that can provide the flow rate calculated above while overcoming the pressure loss through:

• Tank water heater (reference manufacturer’s information)

• All building supply and return plumbing in the circulation loop (reference local plumbing codes, standards, or practices)

B). Optional Method (WH-1-R) - Reference pump manufacturers flow vs. pressure specifications to select a pump that can provide 3 gpm of flow or the flow rate calculated above, whichever is greater, while overcoming the pressure loss through:

• Rinnai tankless water heater (reference flow vs. pressure curve of the Rinnai model being used)

• Optional storage tank (reference manufacturer’s information)

• All building supply and return plumbing in the circulation loop (reference local plumbing codes, standards, or practices)

NOTE: Only use pumps of brass or stainless steel construction. Do not use pumps of iron construction as they will oxidize and clog the inlet filter on the appliance.

Nominal Size, in. Bare Copper Tubing, Btu/h-ft

1/2 in. Glass Fiber Insulated Copper Tubing, Btu/h-ft

3/4 30 17.7

1 38 20.3

1-1/4 45 23.4

1-1/2 53 25.4

2 66 29.6

2-1/2 80 33.8

3 94 39.5

4 120 48.4

Approximate Heat Loss from Piping at 140 ºF Inlet, 70 ºF Ambient *

* Source: 2003 ASHRAE Handbook HVAC Applications

8

Tank Water Heaters in a Circulation Loop The following applies when using a tank water heater (gas or electric) to provide heat for a circulation loop. Drawing WH-1-RGE is an example. The heat output of the tank must be equal to or greater than the calculated circulation loop heat loss. (Reference page 6, Step 1 on calculating heat loss). Electric Tank Water Heater

Since the input and output are the same for an electric tank water heater, this can be expressed as:

Electric Tank Input (Kw) > Circulation loop heat loss (Btu/h) 3413

(1 Kilowatt = 3,413 BTU) Gas Tank Water Heater

When using a gas style water heater, the efficiency of the tank must be taken into account.

Available Btu output = (Btu input of tank) x (efficiency) > Circulation loop heat loss (Btu/h)

Example:

30,000 Btu input gas tank 0.62 Efficiency

30,000 x .62 = 18,600 available Btu output

Additional Guidelines Rinnai water heaters not recovering a storage tank: In applications involving a commercial dishwasher, a hot water circulation loop feeding the dishwasher is required. Rinnai water heater recovering a storage tank: In applications involving a commercial dishwasher, a hot water circulation loop feeding the dishwasher may be required depending on the distance between the dishwasher and the storage tank. Refer to local codes when determining the need for circulation loops to dishwashers.

9

The following applies when using Rinnai tankless water heaters to recover a storage tank. Drawing WH-1-B is an example.

Rinnai Tankless water heaters have a pressure loss which must be considered in the system design. Reference the pressure loss curve for the Rinnai model being used to determine the pump size for the desired recovery rate.

For recommended pump sizes use the table below. Additional pressure losses in plumbing between the Rinnai(s) and the storage tank must also be taken into consideration.

The specified pump size is to provide maximum recovery of the storage tank. A smaller pump size may be used, but could result in longer recovery time of the tank. Please contact the engineering department with any questions on pump sizing.

NOTE: Only use pumps of brass or stainless steel construction. Do not use pumps of iron construction as they will oxidize and clog the inlet filter on the appliance.

Pump Sizing for Storage Tank Application

Pump Flow Requirements

Number of Rinnai Water Heaters

R/C85i/e(PLUS)

R94LSi/e

R/C98i/e(ASME)

R98LSi/e(ASME)

R/C53i(PLUS)

R70e

R75LSi/e

R42e, C42e

V53e

R50LSi

R53e, C53e

R63LSe

1 6 gpm @ 30' head 5 gpm @ 25' head 4 gpm @ 25' head















10

Pressure Loss Curves - V Series Pressure Loss (psi)

Pressure Loss (ft head)

Wat

er F

low

(gpm

)

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

45.0

01

23

45

67

89

1011

0.0

10.0

20.0

30.0

40.0

50.0

60.0

R98i/e R98i/eASME C98i/e C98i/eASME

R85i/e R85i/ePLUS C85i/e C85i/ePLUS

R70e

R53i R53iPLUS C53i C53iPLUS

R42e C42e

R53e C53e

11

Pressure Loss Curves - VA Series Pressure Loss (psi)

Pressure Loss (ft head)

Wat

er F

low

(gpm

)

051015202530354045

01

23

45

67

89

1011

0102030405060708090100

R98LSi/e R98LSi/eASME

R94LSi/e

R75LSi/e

R63LSe

V53e

R50LSi

Drawing Number:

Drawing Date:

Pressure Relief Valve

3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve

Boiler Drain Valve103 International DrivePeachtree City, GA 30269

WH-1

Domestic Hot Water - Standard Installation1 Rinnai Water Heater

Preferred Piping Installation

G as S upply

3/4 " C old W ater S upply Line3/4" Hot Water Supply Line

RinnaiWater Heater

RinnaiEquipment List

RinnaiWater Heaters

QTY

1

June 11, 2007This is not an engineering drawing; it is intended only as a guide and not as a replacement for professional engineering project drawings. This drawing is not intended to describe a complete system. It is up to the contractor or engineer to determine the necessary components and configuration of the particular system to be installed. The drawing does not imply compliance with local building code requirements. It is the responsibility of the engineer or contractor to ensure that the installation is in accordance with all local building codes. Confer with local building officials before installation.

12

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-2

Domestic Hot Water - Standard Installation2 Rinnai Water Heaters


February 27, 2008This is not an engineering drawing; it is intended only as a guide and not as a replacement for professional engineering project drawings. This drawing is not intended to describe a complete system. It is up to the contractor or engineer to determine the necessary components and configuration of the particular system to be installed. The drawing does not imply compliance with local building code requirements. It is the responsibility of the engineer or contractor to ensure that the installation is in accordance with all local building codes. Confer with local building officials before installation.

RinnaiWater Heater

Sub 1

RinnaiWater Heater

Primary

Rinnai Equipment List QTY

Rinnai 2Water Heaters

Electronic Connection *

* Refer to Rinnai Accessories and Model Applicability for electronic connection details.

13

Cold Water Supply Line

Gas Supply

Hot Water Supply Line

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-3




RinnaiWater Heater

Sub 1

RinnaiWater Heater

Sub 2

RinnaiWater Heater

Primary

14


Gas Supply






Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-4




RinnaiWater Heater

Sub 1

RinnaiWater Heater

Sub 2

RinnaiWater Heater

Primary

RinnaiWater Heater

Sub 3

15






Gas Supply


Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-5




RinnaiWater Heater

Sub 1

RinnaiWater Heater

Sub 2

RinnaiWater Heater

Primary

RinnaiWater Heater

Sub 4

RinnaiWater Heater

Sub 3

16


Gas Supply






Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-6




RinnaiWaterHeater

Primary

RinnaiWater

Heater

Sub 1

RinnaiWaterHeater

Sub 2

RinnaiWater

Heater

Primary

RinnaiWater

Heater

Sub 1

RinnaiWater

Heater

Sub 2

Pressure Regulator Set to 5 PSI Below Street Pressure

17


Gas Supply






Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-1-D

Domestic Hot Water - Optional Freeze Protection1 Outdoor Rinnai Water Heater



Minimum 3/4 " C old W aterS upply Line

Minimum 3/4" Hot WaterSupply Line

S

S1/4" MinimumNormally OpenSolenoid Valve

3/4" MinimumNormally ClosedSolenoid Valve

VacuumBreaker

RinnaiEquipment List QTY

IMPORTANT!

With electrical power supplied to a Rinnai water heater, it will not freeze in enviornments as cold as -30ºF, when protected from direct wind exposure.

In the event of a power failure at temperatures below freezing, the water heater should be drained of all water to prevent freezing damage.

The unit may be drained manually or through the installation of the Optional solenoid valves as shown.

The electrical connections for the two solenoid valves should be tied to the 120 V power terminals provided on the PC Board of the water heater.

When the electrical power to the water heater fails, the cold water supply solenoid valve closes, stopping the flow of water into the heater, and the drain down solenoid valve opens, allowing the water heater and associated piping to drain. Ensure that you run the drain for the solenoids per local codes.

OutdoorRinnai

Water Heater

Route drain per local codes

NOTE:

Freeze protect all water pipes and fittings located outside building structure. These are indicated by being above the dashed line.

All pipes and fittings shown below the dashed line should be located inside the building structure.

The vacuum breaker line should be located inside the building structure.

NOTE:

Pipes and fittings can be installed inside a pipe enclosure or recess box and packed with insulation for additional protection.

Outdoor Rinnai 1Water Heater

Gas Supply Line 18

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-2-D

Domestic Hot Water - Optional Freeze Protection2 Outdoor Rinnai Water Heaters



Hot WaterSupply Line

1/4" Normally OpenSolenoid Valve

Normally ClosedSolenoid Valve

(Full size of supply line)

S

S

VacuumBreaker

Sub 1Primary

IMPORTANT!






NOTE:




NOTE:


Route drain per local codes

OutdoorRinnai

Water Heater

OutdoorRinnai

Water Heater


Gas Supply Line

19


Rinnai Outdoor 2Water Heaters



Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-3-D




Hot WaterSupply Line S

S

Sub 2Sub 1Primary

VacuumBreaker

NOTE:




NOTE:


OutdoorRinnai

Water Heater

OutdoorRinnai

Water Heater


Gas Supply Line

OutdoorRinnai

Water Heater

IMPORTANT!






Route drainper local codes

20





Normally Closed Solenoid Valve(Full Size of Cold Water Supply Line)

1/4 “ MinimumNormally Open Solenoid Valve

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-6-D




VacuumBreaker

NOTE:




NOTE:



Gas Supply Line

IMPORTANT!






Route drainper local codes

Hot Water Supply

S

Sub 2Sub 1Primary Sub 2Sub 1Primary

S

Pressure Regulator Set to 5 PSI Below

Street Pressure

OutdoorRinnai

Water Heater

OutdoorRinnai

Water Heater

OutdoorRinnai

Water Heater

OutdoorRinnai

Water Heater

OutdoorRinnai

Water Heater

OutdoorRinnai

Water Heater

21





Normally Closed Solenoid Valve(Full Size of Cold Water Supply Line)

1/4 “ MinimumNormally Open Solenoid Valve

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-1-RGE

Domestic Hot Water - Circulation Systems1 Rinnai Water Heater with Gas or Electric Tank



Expansion Tank

Minimum 3/4 “ Cold Water Supply LineMinimum 3/4 “ Hot

Water Supply Line

Building Supply

Gas Supply Line

RinnaiWater Heater

Important:Install return line to the hot supply line as close as possible to the Rinnai water heater

Gas or Electric Tank Water

Heater

22

For this application:

Pump should be controlled by an Aquastat, Timer or Combination Aquastat and Timer.Pump to be sized to maintain circulation loop temperature. The pump should be sized to overcome the pressure loss through the tank water heater, and supply and return plumbing in the circulation loop. Reference the section Pump Sizing for Circulation.Pump to be of bronze or stainless construc-tion.


Rinnai 1Water Heater

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-1-R

Domestic Hot Water - Circulation Systems1 Rinnai Water Heater

Optional Piping Installation


G as S upply

(Optional)2-6 GallonStorage Tank(To eliminate cold watersandwich e ect caused byfre quent On/O operation)

RinnaiWater Heater

Expansion Tank

Minimum 3/4 “ Cold Water Supply Line

Minimum 3/4 “ Hot Water Supply Line

Building Outlets

23


Pump should be controlled by an Aquastat, Timer or Combination Aquastat and Timer.Pump to be sized to maintain circulation loop temperature. A minimum of 3 GPM flow is recommended for the circulation system.The pump should be sized to overcome the pressure loss through the Rinnai water heater, optional storage tank, and supply and return plumbing in the circulation loop. Reference the section Pump Sizing for Circulation.Pump to be of bronze or stainless construc-tion.

Aquastat Connection


Rinnai 1Water Heater

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-2-RGE

Domestic Hot Water - Circulation Systems2 Rinnai Water Heaters with Gas or Electric Tank



Expansion Tank



Building Supply

Gas Supply Line

RinnaiWater Heater

Primary

RinnaiWater Heater

Sub 1


Heater

24

Important:Install return line to the hot supply line as close as possible to the Rinnai water heater







Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-2-R

Domestic Hot Water - Circulation Systems2 Rinnai Water Heaters

Optional Piping Installation


Gas Supply Line

RinnaiWater Heater

Primary

RinnaiWater Heater

Sub 1

(Optional)2-10 GallonStorage Tank(To eliminate cold watersandwich e ect caused byfre quent On/O operation) Expansion Tank



Building Outlets

25


Pump should be controlled by an Aquastat, Timer or Combination Aquastat and Timer.Pump to be sized to maintain circulation loop temperature. A minimum of 3 GPM flow is recommended for the circulation system.The pump should be sized to overcome the pressure loss through the Rinnai water heater, optional storage tank, and supply and return plumbing in the circulation loop. Reference the section Pump Sizing for Circulation.Pump to be of bronze or stainless construc-tion.

Aquastat Connection





Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-3-RGE




Gas Supply

RinnaiWater Heater

Primary

RinnaiWater Heater

Sub 1



Smaller Return Line Can Be Used After The Last Fixture

Expansion Tank

RinnaiWater Heater

Sub 2

(Optional) Header Sized One Pipe Size Larger Than Hot Water Supply Line - (To eliminate cold water sandwich effect caused by frequent On/Off operation)


Heater

Tank Water Heater sized to maintain circulation loop temperature

26

Building Outlets



Aquastat Connection





Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-6-RGE




27


Gas Supply

RinnaiWaterHeater

Primary

RinnaiWaterHeater

Sub 1

RinnaiWaterHeater

Sub 2

RinnaiWaterHeater

Primary

RinnaiWaterHeater

Sub 1

RinnaiWaterHeater

Sub 2


Smaller Return Line Can Be Used After The Last Fixture

Expansion Tank

(Optional) Header Sized One Pipe Size Larger Than Hot Water Supply Line - (To eliminate cold water sandwich effect caused by frequent On/Off operation) Gas or Electric

Tank Water Heater

Tank Water Heater sized tomaintain circulation loop temperature

Pressure Regulator Set to 5 PSI Below Street Pressure

Building Outlets


Pump should be controlled by an Aquastat, Timer or Combina-tion Aquastat and Timer.Pump to be sized to maintain circulation loop temperature. The pump should be sized to overcome the pressure loss through the tank water heater, and supply and return plumbing in the circulation loop. Refer-ence the section Pump Sizing for Circulation.Pump to be of bronze or stainless construction.

Aquastat Connection





Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-1-B

Domestic Hot Water - Backup Storage1 Rinnai Water Heater



RinnaiWater Heater

Set @ 20°F abovestorage tank Aquastat

Storage Tank

(No Burner or Heating Element)

Submersible Aquastat

(set @ 20°F below Rinnai Temperature

Setting)

28

Reference the section on Pump Sizing for Storage Tank Application.


Rinnai Commercial 1Water Heater

Pump / Aquastat Control WireCold Water Supply Line

Building Hot Water Supply Line

Gas Supply

Expansion Tank

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-1-B-R

Domestic Hot Water - Backup Storage / Circulation1 Rinnai Water Heater



Storage Tank




Setting)

RinnaiWater Heater

Set @ 20°F abovestorage tank Aquastat

29


Building Circulation Pump


Rinnai Commercial 1Water Heater

Pump / Aquastat Control Wire Cold Water Supply Line


Gas Supply

Expansion Tank

Building Hot Water Return Line

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-2-B

Domestic Hot Water - Backup Storage2 Rinnai Water Heaters



RinnaiWater Heater

RinnaiWater Heater

Set water heaters @ 20°Fabove storage tank Aquastat

Storage Tank




Setting)30



Rinnai Commercial 2Water Heaters

Pump / Aquastat Control Wire



Gas Supply

Expansion Tank

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-2-B-R

Domestic Hot Water - Backup Storage / Circulation2 Rinnai Water Heaters



RinnaiWater Heater

RinnaiWater Heater


Storage Tank




Setting)

31








Gas Supply

Expansion Tank


Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-3-B




RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater


Storage Tank




Setting)32






Gas Supply

Expansion Tank

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-3-B-R




RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater


Storage Tank




Setting)

33







Gas Supply

Expansion Tank


Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-6-B




RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater


Storage Tank




Setting)



34





Gas Supply

Expansion Tank

Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


WH-6-B-R




RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater

RinnaiWater Heater


Storage Tank




Setting)



35






Gas Supply

Expansion Tank

Expansion Tank


Drawing Number:

Drawing Date:


3/4" Ball Valve

3/4" Union

Check Valve

Key

S

Pressure Regulator

Circulating Pump

Solenoid Valve


M-1-F 1 Rinnai Water HeaterMaintenance - Scale Flush Procedure


R inna i

G as S upply

V1

V3

V2

V4

H1

H2

H3

Circulating Pump

C old W ate r LineHot Wa ter Line

In-lineF ilter

Flush Procedure

1. Disconnect electrical power to the water heater.2. Close the shutoff valves on both the hot water and cold water lines (V3

and V4).3. Connect pump outlet hose (H1) to the cold water line at service valve V2.4. Connect drain hose (H3) to service valve V1.5. Pour approximately 4 gallons of virgin, food grade, white vinegar or citric

acid into pail.6. Place the drain hose (H3) and the hose (H2) to the pump inlet into the

cleaning solution.7. Open both service valves (V1 and V2) on the hot water and cold water

lines.8. Operate the pump and allow the cleaning solution to circulate through

the water heater for at least 45 minutes.9. Turn off the pump.10. Rinse the cleaning solution from the water heater by:

a. remove the free end of the drain hose (H3) from the pailb. close service valve, V2, and open shutoff valve, V4. Do not open

shutoff valve, V3.c. allow water to flow through the water heater for 5 minutesd. close service valve, V1, and open shutoff valve, V3.

11. Disconnect all hoses.12. Remove the in-line filter at the cold water inlet and clean out any residue.

Place filter back into unit.13. Restore electrical power to the water heater.

36

37

Notes

38

Notes

39

Notes

Rinnai’s other fine products Rinnai America Corporation 103 International Drive

Peachtree City, GA 30269 TOLL FREE: 1-800-621-9419

FAX: 678-829-1666 www.rinnai.us

R-TRWH-E-02 Rev B

2/2008 © 2008 Rinnai America Corporation

Direct Vent Furnaces • High Efficiency • Cool-to-the-touch Cabinet • Blower Included • Vent Terminal A Included • 556 and 1004 Models Available in Beige, White and Silver • Gas Conversion Kit Included

Hydronic Air Handler • Designed for Use with Rinnai Systems • Domestic Hot Water Priority • Optional Programmable Thermostat • Zero Clearance to Combustibles • Accommodates Standard Cased-Coils

Direct-Vent Fireplace, RHFE-750ETR • Up to 83% AFUE Energy Efficiency • Zero-Clearance Installation • Available in Four Options of Fronts • Remotes and Fan Included • Gas Conversion Kit Available

Tankless Water Heaters • Residential and Commercial Applications • Continuous Hot Water • Up to 9.8 GPM • High Energy Efficiency • Propane or Natural Gas • Internal or External Installation • Digital Temperature Control • Small, Compact Design

hot water system rinnai piping manual.pdf

Documents

ball valve

solenoid valve

closed solenoid

electronic

direct wind

local building

power terminals

open solenoid